ES2299298B1 - PROCEDURE FOR MONOLITIC INTEGRATION OF HIGH-MECHANICAL MATERIALS WITH INTEGRATED CIRCUITS FOR MEMS / NEMS APPLICATIONS. - Google Patents
PROCEDURE FOR MONOLITIC INTEGRATION OF HIGH-MECHANICAL MATERIALS WITH INTEGRATED CIRCUITS FOR MEMS / NEMS APPLICATIONS. Download PDFInfo
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- ES2299298B1 ES2299298B1 ES200501833A ES200501833A ES2299298B1 ES 2299298 B1 ES2299298 B1 ES 2299298B1 ES 200501833 A ES200501833 A ES 200501833A ES 200501833 A ES200501833 A ES 200501833A ES 2299298 B1 ES2299298 B1 ES 2299298B1
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- mems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C1/00—Manufacture or treatment of devices or systems in or on a substrate
- B81C1/00015—Manufacture or treatment of devices or systems in or on a substrate for manufacturing microsystems
- B81C1/00222—Integrating an electronic processing unit with a micromechanical structure
- B81C1/00246—Monolithic integration, i.e. micromechanical structure and electronic processing unit are integrated on the same substrate
-
- H01L21/77—
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D84/00—Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers
- H10D84/01—Manufacture or treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C2203/00—Forming microstructural systems
- B81C2203/07—Integrating an electronic processing unit with a micromechanical structure
- B81C2203/0707—Monolithic integration, i.e. the electronic processing unit is formed on or in the same substrate as the micromechanical structure
- B81C2203/0728—Pre-CMOS, i.e. forming the micromechanical structure before the CMOS circuit
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Micromachines (AREA)
- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
- Bipolar Transistors (AREA)
Abstract
Comprende utilizar para la formación de dicha circuitería electrónica y de dichos sistemas micra/nano-electromecánicos, una estructura de al menos tres capas: - una inferior o de base destinada a ser utilizada para formar dichos circuitos electrónicos; - una capa intermedia aislante; y - una capa superior destinada a formar, al menos en parte, dichos MEMS/NEMS, Dicha estructura de al menos tres capas es un substrato, tal como un substrato SOI, cuyas capas están unidas entre sí previamente a la formación en las mismas tanto de los citados circuitos electrónicos como de los referidos MEMS/NEMS, definiéndose en primer lugar unas zonas de dichas capas superior en intermedia donde se desean formar dichos MEMS/NEMS, y eliminándose el resto de dichas capas para poder acceder a la capa inferior y poder formar la circuitería electrónica mediante técnicas convencionales.It comprises using a structure of at least three layers for the formation of said electronic circuitry and of said micron / nano-electromechanical systems: - a bottom or base one intended to be used to form said electronic circuits; - an intermediate insulating layer; and - an upper layer intended to form, at least in part, said MEMS / NEMS, Said structure of at least three layers is a substrate, such as a SOI substrate, whose layers are bonded together prior to formation therein of said electronic circuits such as those referred to MEMS / NEMS, first defining some areas of said upper layers in intermediate where they want to form said MEMS / NEMS, and eliminating the rest of said layers in order to access the lower layer and be able to form electronic circuitry by conventional techniques.
Description
Procedimiento de integración monolítica de materiales de alta calidad mecánica con circuitos integrados para aplicaciones MEMS/NEMS.Monolithic Integration Procedure of High quality mechanical materials with integrated circuits for MEMS / NEMS applications.
La presente invención se refiere a un procedimiento de fabricación de circuitos integrados caracterizado por una técnica de preparación de las obleas para su uso en procesos de fabricación de sistemas micro/nano-electromecánicos (MEMS/NEMS) compatibles con la fabricación de circuitería electrónica, tal como circuitería CMOS estándar.The present invention relates to a integrated circuit manufacturing procedure characterized by a technique of preparing the wafers for use in system manufacturing processes compatible micro / nano-electromechanical (MEMS / NEMS) with the manufacture of electronic circuitry, such as circuitry Standard CMOS.
La solicitud de patente US 2004227201 por "Modules integrating MEMS devices with pre-processed electronic circuitry and methods for fabricating such modules" describe circuitería CMOS con MEMS sobre SOI. La patente propone fabricar un módulo MEMS conforme a una estructura de capas que puede ser una estructura SOI y lo unen adhesivamente a baja temperatura con un substrato que puede ser un substrato con circuitería CMOS integrada.US patent application 2004227201 by "Modules integrating MEMS devices with pre-processed electronic circuitry and methods for fabricating such modules "describes CMOS circuitry with MEMS About SOI. The patent proposes to manufacture a MEMS module according to a layer structure that can be a SOI structure and join it adhesive at low temperature with a substrate that can be a substrate with integrated CMOS circuitry.
Los inventores han tenido asimismo conocimiento de los siguientes artículos relacionados con el objeto de la invención:The inventors have also had knowledge of the following articles related to the purpose of the invention:
- \sqbullet\ sqbullet
- T.J.Brosnihan et al, Embedded Interconnect and Electrical Isolation for High-Aspect Ratio, SOI Inertial Instruments, Transducers 97, 637-640 (Chicago, 1997)TJBrosnihan et al, Embedded Interconnect and Electrical Isolation for High-Aspect Ratio, SOI Inertial Instruments , Transducers 97, 637-640 (Chicago, 1997)
- Se parte de una oblea SOI, en la que tras un pre-proceso se definen una parte de la capa de silicio SOI para formar el MEMS y la otra parte de la misma capa para definir el CMOS.Be part of a SOI wafer, in which after a pre-process they are defined one part of the SOI silicon layer to form the MEMS and the other part of the same layer to define the CMOS.
- \sqbullet\ sqbullet
- T.J.Brosnihan et al., Optical MMEMS^{@}- a fabrication process for MEMS optical switches with integrated on-chip electronics. Transducers'03, 1638-1642, Boston (2003).TJBrosnihan et al., Optical MMEMS ^ @ @ - a fabrication process for MEMS optical switches with integrated on-chip electronics . Transducers'03, 1638-1642, Boston (2003).
- Se describe el uso de tecnología SOI de unión para definir substratos con tres capas de silicio cristalino, el CMOS se realiza en la última capa.The use of SOI binding technology to define substrates with three crystalline silicon layers, the CMOS is performed in the last cap.
A diferencia del procedimiento descrito en la citada patente US 2004227201 en la presente invención se parte de un substrato comercial sobre el cual se definen tanto la circuitería CMOS como el dispositivo MEMS, no necesitando ningún tipo de soldadura.Unlike the procedure described in the cited US Patent 2004227201 in the present invention is based on a commercial substrate on which both the circuitry is defined CMOS as the MEMS device, not needing any type of welding.
En relación a las enseñanzas de los artículos, en la invención que se describirá a continuación no se necesita una tecnología CMOS compatible con SOI, puesto que el CMOS se integra en el silicio de substratoIn relation to the teachings of the articles, In the invention which will be described below, a CMOS technology compatible with SOI, since CMOS is integrated in the substrate silicon
La presente invención se refiere a la integración monolítica de materiales de alta calidad mecánica para aplicaciones MEMS, más en particular a un procedimiento apto para la fabricación de circuitos integrados combinan circuitería electrónica y MEMS/NEMS.The present invention relates to the monolithic integration of high quality mechanical materials for MEMS applications, more particularly to a procedure suitable for integrated circuit manufacturing combine circuitry electronics and MEMS / NEMS.
Conforme a la presente invención, se parte de substratos comerciales tipo SOI (del inglés Silicon On Insulator: silicio sobre aislante). La oblea que hace de substrato debe ser de silicio y tendrá las características eléctricas adecuadas para la fabricación del CMOS mientras que el grosor del óxido aislante y grosor del silicio que conforman la estructura SOI se eligen en función del micro/nano-sistema que se quiera realizar. Esta última capa que servirá para fabricar el micro/nano-sistema puede ser de silicio u otra capa de material a condición que sea compatible con los procesos de fabricación CMOS (silicio, SiC, zafiro,...).In accordance with the present invention, it is based on SOI commercial substrates (Silicon On Insulator): silicon over insulator). The wafer that acts as a substrate must be silicon and will have the proper electrical characteristics for the CMOS manufacturing while insulating oxide thickness and Silicon thickness that make up the SOI structure is chosen in function of the desired micro / nano-system perform. This last layer that will be used to make the micro / nano-system can be silicon or other layer of material on condition that is compatible with the processes of CMOS manufacturing (silicon, SiC, sapphire, ...).
Según el procedimiento que se propone, mediante un proceso previo a las etapas de fabricación de la circuitería CMOS, se prepara la oblea definiendo o seleccionando unas determinadas zonas destinadas a la fabricación de las estructuras dimensiones micro o nanométricas y mediante técnicas de grabado (seco o húmedo) se eliminan posteriormente las capas extras de la oblea para preparar el silicio substrato para la fabricación CMOS.According to the proposed procedure, through a process prior to the manufacturing stages of the circuitry CMOS, the wafer is prepared by defining or selecting certain areas for the manufacture of structures micro or nanometric dimensions and using engraving techniques (dry or wet) the extra layers of the Wafer to prepare the substrate silicon for manufacturing CMOS
Con este procedimiento la fabricación CMOS no se ve alterada por lo que no es necesario modificar las líneas de fabricación establecidas en una "foundry" (fabricación convencional -diseño y métodos de fabricación- de circuitería CMOS por dopaje).With this procedure, CMOS manufacturing is not it is altered so it is not necessary to modify the lines of manufacturing established in a "foundry" Conventional -Design and manufacturing methods- of CMOS circuitry by doping).
Como proceso final, tras las etapas CMOS estándar de la tecnología seleccionada, se fabrica el transductor o transductores mecánicos, tales como: sensores químicos, sensores bioquímicos, sensores de masa, transductores ultrasónicos, espejos para enlaces ópticos y componentes de radiofrecuencia, entre los que se encuentran resonadores, filtros y osciladores.As a final process, after the CMOS stages standard of the selected technology, the transducer is manufactured or mechanical transducers, such as: chemical sensors, sensors biochemicals, mass sensors, ultrasonic transducers, mirrors for optical links and radiofrequency components, between that are resonators, filters and oscillators.
\newpage\ newpage
Esta nueva tecnología permite la utilización de capas estructurales y sacrificiales para el transductor mecánico independientes de la tecnología CMOS utilizada. Así se pueden seleccionar materiales con características mecánicas apropiadas para cada aplicación, lo que hace muy versátil esta técnica.This new technology allows the use of structural and sacrificial layers for the mechanical transducer independent of the CMOS technology used. So you can select materials with appropriate mechanical characteristics for each application, which makes this technique very versatile.
Las anteriores y otras ventajas y características se comprenderán más plenamente a partir de la siguiente descripción de los dibujos adjuntos, que reflejan la transformación de una oblea SOI virgen antes de aplicar el procedimiento propuesto y el resultado obtenido tras dicha aplicación.The above and other advantages and features will be more fully understood from the following description of the attached drawings, which reflect the transformation of a virgin SOI wafer before applying the proposed procedure and the result obtained after said application.
En dichos dibujos:In these drawings:
la Fig. 1 muestra mediante dos vistas, una en
planta y otra en alzado, una oblea SOI utilizable para la formación
de circuitería electrónica y de MEMS/NEMS según el procedimiento
propuesto por la presente invención,
yFig. 1 shows through two views, one in plan and one in elevation, a SOI wafer usable for the formation of electronic circuitry and MEMS / NEMS according to the procedure proposed by the present invention,
Y
la Fig. 2 muestra una sección ampliada de la oblea de la Fig. 1 previa y su transformación una vez ha sido utilizada para fabricar circuitos integrados según el procedimiento propuesto por la presente invención.Fig. 2 shows an enlarged section of the Wafer of the previous Fig. 1 and its transformation once has been used to manufacture integrated circuits according to the procedure proposed by the present invention.
La presente invención concierne a un procedimiento de fabricación de circuitos integrados con circuitería electrónica y MEMS/NEMS, del tipo que comprende utilizar para la formación de dicha circuitería electrónica y de dichos sistemas micro/nano-electromecánicos, una estructura de al menos tres capas, tal como la estructura SOI ilustrada por la Fig. 1:The present invention concerns a integrated circuit manufacturing procedure with electronic circuitry and MEMS / NEMS, of the type comprising use for the formation of said electronic circuitry and of said micro / nano-electromechanical systems, a structure of at least three layers, such as the SOI structure illustrated by Fig. 1:
- \bullet?
- una inferior o de base destinada a ser utilizada para formar dichos circuitos electrónicos;a lower or base intended to be used to form said electronic circuits;
- \bullet?
- una capa intermedia aislante; yan intermediate insulating layer; Y
- \bullet?
- una capa superior destinada a formar, al menos en parte, dichos MEMS/NEMS.a top layer intended for form, at least in part, said MEMS / NEMS.
El procedimiento propuesto por la presente invención está caracterizado porque dicha estructura de al menos tres capas es un substrato cuyas capas están unidas entre sí previamente a la formación en las mismas tanto de los citados circuitos electrónicos como de los referidos MEMS/NEMS, formándose preferentemente estos últimos entre la capa superior y la capa intermedia.The procedure proposed herein invention is characterized in that said structure of at least three layers is a substrate whose layers are joined together prior to training in both of those cited electronic circuits such as those referred to MEMS / NEMS, forming preferably the latter between the upper layer and the layer intermediate.
En la Fig. 1 se muestra una oblea SOI de diámetro d_{obl}, donde pueden apreciarse las tres capas citadas, con sus respectivos grosores t_{sub}, t_{ox} y t_{si} indicados, los cuales han sido escogidos de manera que sean adecuados para la formación de la circuitería CMOS, en el caso de la capa base, y adecuados para la formación de los MEMS/NEMS, en el caso de las otras dos capas.A wafer SOI of diameter d_ {obl}, where the three layers mentioned can be seen, with their respective thicknesses t_ {sub}, t_ {ox} and t_ {si} indicated, which have been chosen so that they are suitable for the formation of the CMOS circuitry, in the case of the base layer, and suitable for the formation of MEMS / NEMS, in the case of the other two layers.
Las características eléctricas de las capas son las adecuadas para los componentes que van a ser formados en ellas, no necesitando por tanto que, por ejemplo la capa inferior, en general consistente en un substrato de silicio, reúna unas características eléctricas adecuadas para la formación de la circuitería CMOS y también de los MEMS/NEMS, sino única y específicamente para la formación de la circuitería CMOS.The electrical characteristics of the layers are suitable for the components that are going to be formed in them, not needing therefore that, for example the lower layer, in general consisting of a silicon substrate, gather some electrical characteristics suitable for the formation of the CMOS circuitry and also MEMS / NEMS, but unique and specifically for the formation of the CMOS circuitry.
El procedimiento propuesto por la presente invención comprende, en primer lugar definir unas zonas donde se pretenden formar los MEMS/NEMS, tanto de la capa superior como, preferentemente, también de la intermedia, tras lo cual se eliminan el resto de ambas capas, es decir las partes no comprendidas en dichas zonas seleccionadas, dejando así acceso a la capa de base para proceder a un tratamiento de dicha capa base o substrato para formar en la misma los citados circuitos electrónicos mediante técnicas convencionales.The procedure proposed herein In the first place, the invention comprises defining areas where they intend to form MEMS / NEMS, both of the upper layer and, preferably, also from the intermediate, after which they are removed the rest of both layers, that is the parts not included in said selected areas, thus allowing access to the base layer to proceed with a treatment of said base layer or substrate for form in said electronic circuits through conventional techniques
En la Fig. 2 puede apreciarse un trozo de una oblea SOI antes (imagen superior) y después (imagen inferior) de la formación de la circuitería electrónica y los MEMS/NEMS.In Fig. 2 a piece of a Wafer SOI before (top image) and after (bottom image) of the formation of electronic circuitry and MEMS / NEMS.
Las tres capas básicas necesarias para la aplicación del procedimiento propuesto, se han indicado en dicha Fig. 2 como SiO_{2} la intermedia, y como Si las otras dos, aunque cada una de dichas capas de silicio no serán necesariamente iguales sino, como se ha apuntado arriba, de las características eléctricas adecuadas para la fabricación de circuitería CMOS, la inferior, y de los MEMS/NEMS, la superior.The three basic layers necessary for the application of the proposed procedure, have been indicated in said Fig. 2 as SiO2 the intermediate, and as If the other two, although each of these layers of silicon will not necessarily be same but, as noted above, the characteristics electrical systems suitable for the manufacture of CMOS circuitry, the lower, and the MEMS / NEMS, the upper.
En la imagen inferior de la Fig. 2 puede observarse un componente CMOS formado en la capa inferior mediante un pozo definido en dicha capa inferior de silicio, un MEMS/NEMS definido en la capa superior de silicio soportado en parte por la capa de óxido intermedia SiO_{2}, y en parte en voladizo debido a la eliminación de parte de dicha capa intermedia, con el fin de que el MEMS/NEMS pueda moverse mecánicamente.In the lower image of Fig. 2 you can a CMOS component formed in the lower layer can be observed by a well defined in said lower silicon layer, a MEMS / NEMS defined in the silicon top layer supported in part by the SiO2 intermediate oxide layer, and partly cantilevered due to the removal of part of said intermediate layer, so that MEMS / NEMS can move mechanically.
Se muestran otra serie de elementos y capas en dicha Fig. 2, tales como los correspondientes a las conexiones eléctricas (mostradas en sección) que conectan los MEMS/NEMS con la circuitería CMOS, así como una capa de pasivación posteriormente superpuesta sobre las zonas del circuito integrado que ocupa la circuitería CMOS, dejando al aire el MEMS/NEMS ilustrado, o gran parte de él.Another series of elements and layers are shown in said Fig. 2, such as those corresponding to the connections electrical (shown in section) that connect the MEMS / NEMS with the CMOS circuitry, as well as a passivation layer later superimposed on the zones of the integrated circuit that occupies the CMOS circuitry, leaving the illustrated MEMS / NEMS on air, or large part of him.
La imagen inferior de la Fig. 2 solamente ilustra un ejemplo de realización de un circuito integrado conseguido mediante la aplicación del procedimiento propuesto, pero un experto en la materia podría conseguir realizar circuitos integrados distintos al ilustrado sin salirse del alcance de la invención según está definido en las reivindicaciones adjuntas.The bottom image of Fig. 2 only illustrates an embodiment of an integrated circuit achieved by applying the proposed procedure, but a subject matter expert could get circuits integrated other than illustrated without going beyond the scope of the invention as defined in the appended claims.
Claims (16)
- \bullet?
- una inferior o de base destinada a ser utilizada para formar dichos circuitos electrónicos;a lower or base intended to be used to form said electronic circuits;
- \bullet?
- una capa intermedia aislante; yan intermediate insulating layer; Y
- \bullet?
- una capa superior destinada a formar, al menos en parte, dichos MEMS/NEMS,a top layer intended for form, at least in part, said MEMS / NEMS,
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200501833A ES2299298B1 (en) | 2005-07-21 | 2005-07-21 | PROCEDURE FOR MONOLITIC INTEGRATION OF HIGH-MECHANICAL MATERIALS WITH INTEGRATED CIRCUITS FOR MEMS / NEMS APPLICATIONS. |
| PCT/ES2006/000428 WO2007010072A2 (en) | 2005-07-21 | 2006-07-21 | Method for the monolithic integration of materials of high mechanical quality with integrated circuits for mems/nems applications |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200501833A ES2299298B1 (en) | 2005-07-21 | 2005-07-21 | PROCEDURE FOR MONOLITIC INTEGRATION OF HIGH-MECHANICAL MATERIALS WITH INTEGRATED CIRCUITS FOR MEMS / NEMS APPLICATIONS. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2299298A1 ES2299298A1 (en) | 2008-05-16 |
| ES2299298B1 true ES2299298B1 (en) | 2009-04-01 |
Family
ID=37669173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES200501833A Expired - Lifetime ES2299298B1 (en) | 2005-07-21 | 2005-07-21 | PROCEDURE FOR MONOLITIC INTEGRATION OF HIGH-MECHANICAL MATERIALS WITH INTEGRATED CIRCUITS FOR MEMS / NEMS APPLICATIONS. |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES2299298B1 (en) |
| WO (1) | WO2007010072A2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003076330A2 (en) * | 2002-03-08 | 2003-09-18 | Cornell Research Foundation, Inc. | Silicon carbide microelectromechanical devices with electronic circuitry |
| WO2004071943A2 (en) * | 2003-02-11 | 2004-08-26 | Koninklijke Philips Electronics N.V. | Electronic device and its manufacturing method device |
| EP1452481A2 (en) * | 2003-02-07 | 2004-09-01 | Dalsa Semiconductor Inc. | Fabrication of advanced silicon-based MEMS devices |
| WO2005017972A2 (en) * | 2003-08-15 | 2005-02-24 | The Charles Stark Draper Laboratory, Inc. | Method for microfabricating structures using silicon-on-insulator material |
-
2005
- 2005-07-21 ES ES200501833A patent/ES2299298B1/en not_active Expired - Lifetime
-
2006
- 2006-07-21 WO PCT/ES2006/000428 patent/WO2007010072A2/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003076330A2 (en) * | 2002-03-08 | 2003-09-18 | Cornell Research Foundation, Inc. | Silicon carbide microelectromechanical devices with electronic circuitry |
| EP1452481A2 (en) * | 2003-02-07 | 2004-09-01 | Dalsa Semiconductor Inc. | Fabrication of advanced silicon-based MEMS devices |
| WO2004071943A2 (en) * | 2003-02-11 | 2004-08-26 | Koninklijke Philips Electronics N.V. | Electronic device and its manufacturing method device |
| WO2005017972A2 (en) * | 2003-08-15 | 2005-02-24 | The Charles Stark Draper Laboratory, Inc. | Method for microfabricating structures using silicon-on-insulator material |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2299298A1 (en) | 2008-05-16 |
| WO2007010072A3 (en) | 2007-05-03 |
| WO2007010072A2 (en) | 2007-01-25 |
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